@incollection{MEM_2021_50_a30,
     author = {Karakasheva, Lilyana and Kovacheva, Antoaneta},
     title = {The educational potential of crossword puzzles in mathematics education},
     booktitle = {},
     series = {Mathematics and Education in Mathematics},
     pages = {261--266},
     year = {2021},
     volume = {50},
     language = {bg},
     url = {http://geodesic.mathdoc.fr/item/MEM_2021_50_a30/}
}